:root {
  color-scheme: dark;
  --bg: #050a10;
  --panel: #09131f;
  --panel-2: #0d1a29;
  --text: #eef8ff;
  --muted: #91a8b8;
  --cyan: #38d8ff;
  --lime: #b7ff4a;
  --line: rgba(56, 216, 255, 0.2);
  --max: 1160px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 280px;
  background:
    radial-gradient(circle at 78% 8%, rgba(56, 216, 255, 0.12), transparent 31rem),
    radial-gradient(circle at 8% 45%, rgba(183, 255, 74, 0.07), transparent 28rem),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 18px 0;
  background: rgba(5, 10, 16, 0.78);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 900;
  text-decoration: none;
  letter-spacing: 0.02em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--cyan);
  border-radius: 8px;
  color: var(--cyan);
  box-shadow: 0 0 22px rgba(56, 216, 255, 0.2);
}

.topbar nav, footer nav {
  display: flex;
  gap: 22px;
}

.topbar nav a, footer nav a {
  color: var(--muted);
  font-size: 0.88rem;
  text-decoration: none;
}

.topbar nav a:hover, .topbar nav a:focus-visible,
footer nav a:hover, footer nav a:focus-visible { color: var(--cyan); }

main { overflow: hidden; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(460px, 1.22fr);
  align-items: center;
  gap: clamp(28px, 4vw, 58px);
  width: min(1320px, calc(100% - 40px));
  min-height: 690px;
  margin: 0 auto;
  padding: 70px 0 100px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--lime);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.08; }

h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.2rem);
  letter-spacing: -0.065em;
}

h1 span {
  color: transparent;
  -webkit-text-stroke: 1px var(--cyan);
  text-shadow: 0 0 34px rgba(56, 216, 255, 0.2);
}

.hero-text {
  max-width: 660px;
  margin: 28px 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.primary-button, .secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 900;
  text-decoration: none;
}

.primary-button {
  background: var(--lime);
  color: #091006;
  box-shadow: 0 12px 40px rgba(183, 255, 74, 0.16);
}

.primary-button:hover, .primary-button:focus-visible { background: #caff79; }

.secondary-button {
  border: 1px solid var(--line);
  color: var(--cyan);
}

.play-note { color: #668090; font-size: 0.78rem; }

.arena-preview {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  width: 100%;
  justify-self: end;
  border-radius: 26px;
  background: #07111b;
  box-shadow: 0 40px 110px rgba(0, 0, 0, 0.48), 0 0 70px rgba(56, 216, 255, 0.12);
  isolation: isolate;
  transform: perspective(1200px) rotateY(-2.2deg) rotateX(0.8deg);
  transform-origin: center;
  transition: transform 500ms ease, box-shadow 500ms ease;
}

.arena-preview:hover {
  transform: perspective(1200px) rotateY(-0.6deg) rotateX(0.2deg) translateY(-5px) scale(1.008);
  box-shadow: 0 42px 110px rgba(0, 0, 0, 0.52), 0 0 84px rgba(56, 216, 255, 0.17);
}

.arena-preview::before {
  content: "";
  position: absolute;
  inset: -2px;
  z-index: 4;
  border: 1px solid rgba(183, 255, 74, 0.26);
  border-radius: inherit;
  pointer-events: none;
  animation: scene-border 3.8s ease-in-out infinite;
}

.arena-preview img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.025);
  filter: saturate(1.08) contrast(1.04);
  animation: scene-breathe 8s ease-in-out infinite;
}

.scene-vignette {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(5, 10, 16, 0.03) 55%, rgba(5, 10, 16, 0.62)),
    radial-gradient(circle at 50% 48%, transparent 35%, rgba(5, 10, 16, 0.28) 100%);
  pointer-events: none;
}

.scene-scan {
  position: absolute;
  inset: -30% 0 auto;
  z-index: 2;
  height: 32%;
  background: linear-gradient(180deg, transparent, rgba(56, 216, 255, 0.1), transparent);
  mix-blend-mode: screen;
  pointer-events: none;
  animation: scene-scan 4.8s linear infinite;
}

.scene-particle {
  position: absolute;
  z-index: 3;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  opacity: 0;
  pointer-events: none;
  animation: scene-particle 3.4s ease-out infinite;
}

.particle-one { left: 47%; top: 50%; }
.particle-two { left: 54%; top: 44%; animation-delay: 1.1s; }
.particle-three { left: 43%; top: 55%; animation-delay: 2.2s; }

@keyframes scene-breathe {
  0%, 100% { transform: scale(1.025) translate3d(0, 0, 0); }
  50% { transform: scale(1.055) translate3d(-0.4%, -0.3%, 0); }
}

@keyframes scene-scan {
  from { transform: translateY(0); }
  to { transform: translateY(410%); }
}

@keyframes scene-particle {
  0% { opacity: 0; transform: translate3d(0, 12px, 0) scale(0.5); }
  22% { opacity: 0.9; }
  100% { opacity: 0; transform: translate3d(26px, -35px, 0) scale(1.3); }
}

@keyframes scene-border {
  0%, 100% { opacity: 0.55; box-shadow: inset 0 0 24px rgba(56, 216, 255, 0.04); }
  50% { opacity: 1; box-shadow: inset 0 0 36px rgba(56, 216, 255, 0.12); }
}

.section, .cta-section {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 100px 0;
}

.intro-section {
  display: grid;
  grid-template-columns: 0.8fr 1fr;
  gap: clamp(30px, 8vw, 120px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

h2 { margin: 0 0 20px; font-size: clamp(2rem, 4vw, 3.8rem); letter-spacing: -0.045em; }
.intro-section > p, .intro-section > div:last-child > p, .mode-copy > p:last-child { color: var(--muted); font-size: 1.03rem; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 42px;
}

.feature-grid article {
  min-height: 235px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(13, 26, 41, 0.94), rgba(7, 17, 29, 0.85));
}

.feature-number { color: var(--cyan); font-family: ui-monospace, monospace; font-size: 0.75rem; }
.feature-grid h3 { margin: 45px 0 10px; font-size: 1.2rem; }
.feature-grid p { margin: 0; color: var(--muted); }

.modes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
}

.mode-list { display: grid; gap: 10px; }
.mode-list div { padding: 21px; border-left: 2px solid var(--cyan); background: rgba(56, 216, 255, 0.05); }
.mode-list strong, .mode-list span { display: block; }
.mode-list span { color: var(--muted); font-size: 0.88rem; }

.cta-section {
  margin-bottom: 90px;
  padding: clamp(44px, 8vw, 90px);
  border: 1px solid rgba(183, 255, 74, 0.28);
  border-radius: 22px;
  background: radial-gradient(circle at 80% 30%, rgba(183, 255, 74, 0.13), transparent 26rem), var(--panel);
  text-align: center;
}

.cta-section p:not(.eyebrow) { max-width: 620px; margin: 0 auto 28px; color: var(--muted); }

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 44px;
  border-top: 1px solid var(--line);
}

footer div { display: grid; }
footer span { color: var(--muted); font-size: 0.78rem; }

.page-shell {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 110px;
}

.page-hero { max-width: 820px; padding: 34px 0 62px; }
.page-hero h1 { font-size: clamp(2.8rem, 7vw, 5.4rem); }
.page-hero > p:last-child { max-width: 720px; color: var(--muted); font-size: 1.06rem; }

.breadcrumb {
  display: inline-flex;
  margin-bottom: 34px;
  color: var(--cyan);
  font-size: 0.88rem;
  text-decoration: none;
}

.content-section { padding: 58px 0; border-top: 1px solid var(--line); }
.content-section > p { max-width: 820px; color: var(--muted); }

.article-grid, .link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 30px;
}

.article-card, .link-card, .control-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(13, 26, 41, 0.94), rgba(7, 17, 29, 0.85));
}

.article-card h2, .article-card h3, .link-card h3, .control-card h2 {
  margin: 0 0 12px;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.article-card p, .link-card p, .control-card p { margin: 0; color: var(--muted); }
.article-card ul { margin: 14px 0 0; padding-left: 20px; color: var(--muted); }
.article-card li + li { margin-top: 7px; }

.link-card {
  min-height: 190px;
  color: inherit;
  text-decoration: none;
  transition: border-color 180ms ease, transform 180ms ease;
}
.link-card:hover, .link-card:focus-visible { border-color: var(--cyan); transform: translateY(-3px); }
.link-card .feature-number { display: block; margin-bottom: 42px; }

.control-list { display: grid; gap: 10px; margin-top: 18px; }
.control-row { display: grid; grid-template-columns: 150px 1fr; gap: 20px; align-items: center; }
.control-row kbd {
  justify-self: start;
  padding: 7px 10px;
  border: 1px solid rgba(56, 216, 255, 0.35);
  border-bottom-width: 3px;
  border-radius: 7px;
  background: #07111b;
  color: var(--cyan);
  font: 700 0.82rem ui-monospace, monospace;
}
.control-row span { color: var(--muted); }

.notice {
  margin-top: 28px;
  padding: 22px 24px;
  border-left: 3px solid var(--lime);
  background: rgba(183, 255, 74, 0.06);
  color: var(--muted);
}
.page-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

.legal-page { width: min(820px, calc(100% - 40px)); margin: 0 auto; padding: 70px 0 110px; }
.legal-page h1 { font-size: clamp(2.5rem, 7vw, 4.8rem); }
.legal-page h2 { margin-top: 42px; font-size: 1.4rem; letter-spacing: -0.02em; }
.legal-page p, .legal-page li, .legal-page address { color: var(--muted); }
.legal-page address { font-style: normal; }
.legal-page a { color: var(--cyan); }
.legal-back { display: inline-flex; margin-bottom: 40px; color: var(--cyan); text-decoration: none; }

@media (max-width: 1050px) {
  .hero { grid-template-columns: 1fr; padding-top: 55px; }
  .arena-preview {
    width: min(100%, 860px);
    justify-self: center;
    transform: none;
  }
  .arena-preview:hover { transform: translateY(-3px); }
}

@media (max-width: 820px) {
  .topbar nav { display: none; }
  .intro-section, .modes { grid-template-columns: 1fr; gap: 24px; }
  .feature-grid { grid-template-columns: 1fr; }
  footer { align-items: flex-start; gap: 24px; }
  footer nav { flex-wrap: wrap; gap: 12px 18px; }
  .article-grid, .link-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .topbar, .hero, .section, .cta-section, footer { width: min(100% - 28px, var(--max)); }
  h1 { font-size: clamp(2.7rem, 14vw, 4.2rem); }
  .hero { min-height: auto; padding-bottom: 70px; }
  .feature-grid article { min-height: auto; }
  footer { flex-direction: column; }
  .page-shell { width: min(100% - 28px, var(--max)); }
  .control-row { grid-template-columns: 1fr; gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .arena-preview,
  .arena-preview img,
  .arena-preview::before,
  .scene-scan,
  .scene-particle { animation: none; transition: none; }
}